AMD's Budget Video Cards Pack Punches

Need a new videocard, but don’t have the Benjamins—or the need—for a high-end model ? Take a look at some of the new budget cards, such as AMD’s ATI Radeon HD 4600 series : AMD’s latest videocards promise to deliver decent gaming performance—and 512 MB frame buffers—for as little as $69

AMD has so far announced two SKUs in this series : The Radeon HD 4650 ($69) and the Radeon HD 4670 ($79). The company plans to ship a third model, which will be outfitted with 1GB of memory, later this month. Both announced cards have the same GPU, which boasts 320 stream-processing units, but a relatively narrow 128-bit memory interface (AMD’s pricier parts have 256-bit memory interfaces, and Nvidia’s top-end GPU has a 512-bit memory interfaces). The 4650’s core clock speed will be set at 600 MHz (compared to the 4670’s 750 MHz).

This is one case where overclocking the cheaper card to achieve the same performance as the more expensive model isn’t going to work : The higher-priced 4670 features GDDR3 memory clocked at 1GHz, but the cheaper model rolls with GDDR2 memory running at just 500MHz. No amount of tweaking is going to compensate for that architectural disadvantage.

These cards are particularly intriguing for those whose interests lie less in gaming and more in 2D and video applications, because the GPU used in both boards features ATI’s Unified Video Decoder (UVD), Avivo HD technology, and support for 7.1-channel surround sound via HDMI. UVD is capable of offloading all HD video-decoding operations from the host CPU, which means you can build a home-theater PC using a cheaper (and cooler) CPU than you might otherwise need.

Nvidia’s new cards can also output surround-sound via HDMI, but their solution is a bit clumsy : When you install the card, you must also route a S/PDIF cable from your motherboard to the card. AMD’s newer cards route audio over the bus, so there’s no need for cable.